Warmane is not owned, but I will answer your post on behalf of staff. Neither is Warmane a business, but a community where inspiration to create the best overall gameplay experience that we're capable of. Warmane is successful enough to be viewed or desired by "some" people as a business. Subject of donations is also not important nor is the priority for us, but seems to be a priority for you instead. I hope this response will be useful to cast away some of the wrong thoughts you have, which will continue growing unless explained and can be used as a reference for similar confusion.
Wrath of the Lich King development has had majority of development dedicated to it, but over time as the core was improved, so did the remaining bugs prove to be:
a) Highly time consuming. Requiring significant rewrite of the code by dedicating one or two developers for months without any visible progress just to achieve Malygos's flight work properly, which is for example spline system, and once implemented and inevitably broke many existing end-game encounters such as the Gunship battle, which (together with many other scripts) at the time of implementation was scripted without the current spline system. It has now been 2 times that spline system was launched live, unsuccessfully, retracted and worked on further in the background by at least 2 developers for months now.
b) We haven't been able to to fix something simply because it is beyond the skill level of a developer.
c) Priorities lay on more pressing matters. More pressing matters include fixing Cataclysm which is missing 70% of non-end game content and starting zones, Mists of Pandaria having 90% of end-game content missing compared to Wrath of the Lich King's 5% and is in a very good condition comparatively as well as constant crash fixes, lag corrections, memory leaks, hundreds of exploits, underground gold dupes and external trade systems etc. All of these require constant immediate attention and comprise majority of maintaining and developing a private server on a daily basis.
Your post is also very shortsighted. Mists of Pandaria has nearly the same population as Wrath of the Lich King, while lacking much more content and potentially having a lot of improvements to implement (expansion experience not included, which is subjective). Your post literally demands that we dismiss everything else and focus on Wrath of the Lich King - which is in a MUCH better working condition. Your post dismisses that at least as many players as on Wrath of the Lich King are playing on Cataclysm and Mists of Pandaria realms while having much worse experience. We've been there and seen those awesome ac-web repacks with "99% of content working", at the end of the day nothing and nobody is holding anyone from playing there and it is ultimately your own choice to play here or not.
Warmane is not a business, it's a private server that is successful by people's choices and is able to maintain itself, develop and fund and allocates them correctly, even considering the disasters that had happened to some of the staff members and events that must be considered when considering Wrath of the Lich King core and its 2 years of development, or lack of it. Your post either does not care or know about these things. Wrath of the Lich King had more attention to it in the last 2 months of hell and disaster, than it had in the last 2 years of peace and flourishing. At the end of the day, even though some people don't know many things and don't care (as seen in your post) Wrath of the Lich King always has attention from us and will continue having attention. Criticism is welcome and vital, but only if helpful and points out shortcomings on our side. In a post like yours it doesn't include or is aware of many other processes that take place in the background that can directly impact what we want vs what we are able to.
We are constantly working and improving, I can say it on behalf of staff and our results are the updates that take place everywhere we can. As for your last sentence, Warmane is not a company, nor is it a business or a business model, and considering how much you care, I recommend you educate yourself further on the subject of how private servers are run and Warmane as well. We know our priorities very well and very clearly with respect to what we can do, can't do, should do and shouldn't do. Unfortunately if we did everything we wanted to do or everything players wanted us to do, we would stop existing long ago, please keep these things in mind and once you do, any further criticism with respect to the things I pointed out is welcome and will be helpful for us to improve.